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Originally Posted by Jellby
How great! The user enlarges the font size to be able to read it and it doesn't work! 
I agree it's nice and it may be useful for some purposes...
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Yes, that is the idea

You say well, it may be useful for only some purposes (captions, some titles and subtitles and similars -maybe text in tables-). There where we like to use svg text, we could use viewport sized typography. Of course, we are not going to use that feature for normal text
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But as mentioned above do not expect it to work in any ePub reader (though it might somehow work in browser-based readers)
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Yes, so far no ereader supports that property. I read that webkit had support for it but I tried in Kindle and nothing; Kindle ignores styes with "vw" units.